import _thread as thread
import base64
import datetime
import hashlib
import hmac
import json
import ssl
import time
from urllib.parse import urlparse, urlencode
from datetime import datetime
from time import mktime
from wsgiref.handlers import format_date_time
import websocket
import logging

from .base import Chat
from .config import SPARK_CONFIG, SYSTEM_PROMPT


logger = logging.getLogger("chat")


class SparkChat(Chat):

    def __init__(self, name="spark"):
        self.spark = _Spark()
        logger.info("spark get")
        self.myhistory = _History()
        logger.info("history get")
        super().__init__(name)
        logger.info("SparkChat initialized.")

    def chat(self, question):
        logger.info(f"{SPARK_CONFIG['debug']=}")
        logger.info(f"{question=}")
        question = SYSTEM_PROMPT + question
        self.myhistory.append("user", question)
        logger.info(f"trying to get answer...")
        if not SPARK_CONFIG["debug"]:
            answer = self.spark.main(
                SPARK_CONFIG["appid"],
                SPARK_CONFIG["api_key"],
                SPARK_CONFIG["api_secret"],
                SPARK_CONFIG["Spark_url"],
                SPARK_CONFIG["domain"],
                self.myhistory.get_history())
        else:
            answer = "Text text here because debug=True"

        logger.info(f"{answer[:50]=}")
        self.myhistory.append("assistant", answer)
        return answer

    def __repr__(self):
        return f"<Chat {self.name} history={self.myhistory}>"


class _Ws_Param(object):

    def __init__(self, APPID, APIKey, APISecret, Spark_url):
        self.APPID = APPID
        self.APIKey = APIKey
        self.APISecret = APISecret
        self.host = urlparse(Spark_url).netloc
        self.path = urlparse(Spark_url).path
        self.Spark_url = Spark_url

    # 生成url
    def create_url(self):
        # 生成RFC1123格式的时间戳
        now = datetime.now()
        date = format_date_time(mktime(now.timetuple()))

        # 拼接字符串
        signature_origin = "host: " + self.host + "\n"
        signature_origin += "date: " + date + "\n"
        signature_origin += "GET " + self.path + " HTTP/1.1"

        # 进行hmac-sha256进行加密
        signature_sha = hmac.new(self.APISecret.encode('utf-8'), signature_origin.encode('utf-8'),
                                 digestmod=hashlib.sha256).digest()

        signature_sha_base64 = base64.b64encode(signature_sha).decode(encoding='utf-8')

        authorization_origin = f'api_key="{self.APIKey}", algorithm="hmac-sha256", headers="host date request-line", signature="{signature_sha_base64}"'

        authorization = base64.b64encode(authorization_origin.encode('utf-8')).decode(encoding='utf-8')

        # 将请求的鉴权参数组合为字典
        v = {
            "authorization": authorization,
            "date": date,
            "host": self.host
        }
        # 拼接鉴权参数，生成url
        url = self.Spark_url + '?' + urlencode(v)
        # 此处打印出建立连接时候的url,参考本demo的时候可取消上方打印的注释，比对相同参数时生成的url与自己代码生成的url是否一致
        return url


class _History:
    values = []

    def append(self, role, content):
        self.values.append({
            "role": role,
            "content": content,
        })

        self.__cutoff()

    def __cutoff(self):
        length = sum(len(_["content"]) for _ in self.values)
        while length > 8000:
            length -= len(self.values[0]["content"])
            del self.values[0]

    def get_history(self):
        return self.values.copy()

    def __repr__(self):
        return f"<{__class__.__name__} {self.values}>"


class _Spark:
    answer = ""

    def on_message(self, ws, message):
        data = json.loads(message)
        code = data['header']['code']
        if code != 0:
            logger.error(f"bad request: {code}, {data}")
            ws.close()
        else:
            choices = data["payload"]["choices"]
            status = choices["status"]
            content = choices["text"][0]["content"]
            self.answer += content
            if status == 2:
                ws.close()

    # 收到websocket错误的处理
    def on_error(self, ws, error):
        logger.error(error)

    # 收到websocket关闭的处理
    def on_close(self, ws,one,two):
        logger.info("websocket was closed")

    # 收到websocket连接建立的处理
    def on_open(self, ws):
        thread.start_new_thread(self.run, (ws,))

    def run(self, ws, *args):
        data = json.dumps(self.gen_params(appid=ws.appid, domain= ws.domain,question=ws.question))
        ws.send(data)

    def gen_params(self, appid, domain,question):
        """
        通过appid和用户的提问来生成请参数
        """
        data = {
            "header": {
                "app_id": appid,
                "uid": "1234"
            },
            "parameter": {
                "chat": {
                    "domain": domain,
                    "random_threshold": 0.5,
                    "max_tokens": 2048,
                    "auditing": "default"
                }
            },
            "payload": {
                "message": {
                    "text": question
                }
            }
        }
        return data

    def main(self, appid, api_key, api_secret, Spark_url,domain, question):
        logger.info("entered main()")
        self.answer = ""
        wsParam = _Ws_Param(appid, api_key, api_secret, Spark_url)
        websocket.enableTrace(False)
        wsUrl = wsParam.create_url()
        logger.info("trying to get ws...")
        ws = websocket.WebSocketApp(
            wsUrl,
            on_message=self.on_message,
            on_error=self.on_error,
            on_close=self.on_close,
            on_open=self.on_open
        )
        logger.info("trying to get ws...done")
        ws.appid = appid
        ws.question = question
        ws.domain = domain
        logger.info("ws will run forever...")
        ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})
        logger.info(f"{ws=}")
        return self.answer

